flushdata (Data Acquisition Toolbox)

Remove data from the data acquisition engine

Syntax

```
flushdata(obj)
flushdata(obj,'mode')
```

Arguments

obj
An analog input object or array of analog input objects.

'mode'
Specifies how much data is removed from the engine.

`obj`	An analog input object or array of analog input objects.
'`mode`'	Specifies how much data is removed from the engine.

Description

flushdata(obj) removes all data from the data acquisition engine and resets the SamplesAvailable property to zero.

flushdata(obj,'mode') removes data from the data acquisition engine depending on the value of mode. If mode is all, all data is removed from the engine and the SamplesAvailable property is set to 0. This is the same as flushdata(obj). If mode is triggers, then data is removed from the engine only when the data corresponds to an integral number of triggers. triggers is a valid choice only when the TriggerRepeat property is greater than 0 and the SamplesPerTrigger property is not inf.

Example

Create the analog input object ai for a National Instruments board and add hardware channels 0-7 to it.

ai = analoginput('nidaq',1);
addchannel(ai,0:7);

A two-second acquisition is configured and the device object is executed.

set(ai,'SampleRate',2000)
duration = 2;
ActualRate = get(ai,'SampleRate');
set(ai,'SamplesPerTrigger',ActualRate*duration)
start(ai)

Four thousand samples will be acquired for each channel group member. To extract 1000 samples from the data acquisition engine for each channel:

```
data = getdata(ai,1000);
```

You can use flushdata to remove the remaining 3000 samples from the data acquisition engine.

flushdata(ai)
ai.SamplesAvailable
ans =
     0

See Also

Functions

getdata

Properties

SamplesAvailable, SamplesPerTrigger, TriggerRepeat

disp get